var time;



function setup() {

  createCanvas(windowWidth,

               windowHeight);

  noFill();



  time = 0.0;

}



function draw() {

  background(70, 70, 40);



  var num = 50;

  for (var i = 1; i < num; i = i + 1.5) {

    var G = i * (200 / num);

    var B = 200 + i * (200 / num);

    var R = 150 + i * (150 / num);

    stroke(G, B, R);



    var x = windowWidth / 100;

    var y = windowHeight /90;

    var spX = 0.6 * i * windowWidth / num;

    var spY = 0.7 * i * windowHeight / num;

    // var dia = spX;

    var dia = spX * sin(0.2 * i - time);

    stamp(x, y, spX, spY, dia);

  }



  time = time + 0.05;

}



function stamp(x, y, spaceX, spaceY, diameter) {

  ellipse(x + spaceX, y + spaceY, diameter);

  ellipse(x + spaceX, y + spaceY, diameter);

  ellipse(x + spaceX, y + spaceY, diameter);

  ellipse(x + spaceX, y + spaceY, diameter);

}